reworked autorestore + added touchkeyboard compatibility

com/codemirror.js

@@ -36,7 +36,7 @@ AFRAME.registerComponent('codemirror', {
 
     css:     (me) => `.CodeMirror{
                         width: ${me.com.data.width}px !important;
-                        height: ${me.com.data.height}px !important;
+                        height: ${me.com.data.height-30}px !important;
                      }
                      .codemirror *{
                        font-size: 14px;
@@ -45,7 +45,10 @@ AFRAME.registerComponent('codemirror', {
                        letter-spacing: 0 !important;
                        text-shadow: 0px 0px 10px #F075;
                      }
-                     #${me.dom.id} .wb-body { overflow:hidden; }
+
+                    .wb-body:has(> .codemirror){ 
+                      overflow:hidden; 
+                    }
 
                      .CodeMirror {
                       margin-top:18px;
@@ -78,11 +81,30 @@ AFRAME.registerComponent('codemirror', {
       this.editor.updateFile( this.data.file, instance.getValue() )
     })
 
+    this
+    .handleFocus()
+
     setTimeout( () => {
       this.el.setAttribute("html-as-texture-in-xr", `domid: #${this.el.dom.id}`)  // only show aframe-html in xr 
     },1500)
   },
 
+  handleFocus: function(){
+    const focus = (showdom) => (e) => {
+      if( this.editor ){
+        this.editor.focus()
+      }
+      if( this.el.components.window && this.data.renderer == 'canvas'){
+        this.el.components.window.show( showdom )
+      }
+    }
+    this.el.addEventListener('obbcollisionstarted', focus(false) )
+    this.el.sceneEl.addEventListener('enter-vr', focus(false) )
+    this.el.sceneEl.addEventListener('enter-ar', focus(false) )
+    this.el.sceneEl.addEventListener('exit-vr', focus(true) )
+    this.el.sceneEl.addEventListener('exit-ar', focus(true) )
+  },
+
   updateFile: async function(file,str){
     // we don't do via shellcmd: isoterminal.exec(`echo '${str}' > ${file}`,1) 
     // as it would require all kindof ugly stringescaping

com/html-as-texture-in-xr.js

@@ -21,7 +21,7 @@ if( !AFRAME.components['html-as-texture-in-xr'] ){
       this.el.setAttribute("html",`html: ${this.data.domid}; cursor:#cursor; xrlayer: true`)
       this.el.setAttribute("visible",  AFRAME.utils.XD() == '3D' ? 'true' : 'false' )
       if( this.data.faceuser ){
-        this.el.setAttribute("position", AFRAME.utils.XD.getPositionInFrontOfCamera(0.5) )
+        this.el.setAttribute("position", AFRAME.utils.XD.getPositionInFrontOfCamera(0.8) )
       }
     },
 

com/isoterminal.js

@@ -37,6 +37,7 @@ if( typeof AFRAME != 'undefined '){
       overlayfs:      { type:"string"},
       width:          { type: 'number',"default": -1 },
       height:         { type: 'number',"default": -1 },
+      depth:          { type: 'number',"default": 0.03 },
       lineHeight:     { type: 'number',"default": 18 },
       padding:        { type: 'number',"default": 18 },
       minimized:      { type: 'boolean',"default":false},
@@ -44,19 +45,18 @@ if( typeof AFRAME != 'undefined '){
       muteUntilPrompt:{ type: 'boolean',"default":true},     // mute stdout until a prompt is detected in ISO
       HUD:            { type: 'boolean',"default":false},    // link to camera movement 
       transparent:    { type:'boolean', "default":false },   // need good gpu
-      memory:         { type: 'number',  "default":64  },    // VM memory (in MB)
-      bufferLatency:  { type: 'number', "default":30  },    // in ms: bufferlatency from webworker to xterm (batch-update every char to texture)
+      memory:         { type: 'number',  "default":40  },    // VM memory (in MB) [NOTE: quest or smartphone might crash > 40mb ]
+      bufferLatency:  { type: 'number', "default":1  },    // in ms: bufferlatency from webworker to xterm (batch-update every char to texture)
       debug:          { type: 'boolean', "default":false }
     },
 
     init: function(){
       this.el.object3D.visible = false
-      if( this.data.width == -1  ) this.data.width = document.body.offsetWidth
-      if( this.data.height == -1 ) this.data.height = document.body.offsetHeight
-      this.data.width -= this.data.padding*2
-      this.data.height -= this.data.padding*2
 
+      this.calculateDimension()
       this.initHud()
+      this.setupBox()
+
       fetch(this.data.iso,{method: 'HEAD'})
       .then( (res) => {
         if( res.status != 200 ) throw 'not found'
@@ -79,17 +79,17 @@ if( typeof AFRAME != 'undefined '){
       selfcontain:   "com/selfcontainer.js",
       // html to texture
       htmlinxr:      "com/html-as-texture-in-xr.js",
-      // isoterminal features
+      // isoterminal global features
       PromiseWorker: "com/isoterminal/PromiseWorker.js",
       ISOTerminal:   "com/isoterminal/ISOTerminal.js",
-      localforage:   "https://cdn.rawgit.com/mozilla/localForage/master/dist/localforage.js"
+      localforage:   "com/isoterminal/localforage.js",
     },
 
     dom: {
-      scale: 1.0,
+      scale: 0.66,
       events:  ['click','keydown'],
       html:    (me) => `<div class="isoterminal">
-                          <div id="vt100" tabindex="0">
+                          <div id="term" tabindex="0">
                             <pre></pre>
                           </div>
                         </div>`,
@@ -105,7 +105,7 @@ if( typeof AFRAME != 'undefined '){
                           position:relative;
                           line-height: ${me.com.data.lineHeight}px;
                         }
-                        #vt100 {
+                        #term {
                           outline: none !important;
                         }
                         @font-face {
@@ -127,10 +127,6 @@ if( typeof AFRAME != 'undefined '){
                           border:none;
                           padding:none;
                         }
-                        span blink:last-of-type{
-                          border-right: 8px solid #F07;
-                          padding-right: 3px;
-                        }
 
                         #overlay .winbox:has(> .isoterminal){ 
                           background:transparent;
@@ -218,8 +214,10 @@ if( typeof AFRAME != 'undefined '){
       this.term = new ISOTerminal(instance,this.data)
 
       instance.addEventListener('DOMready', () => {
-        instance.setAttribute("html-as-texture-in-xr", `domid: #${this.el.dom.id}; faceuser: true`)
-        setTimeout( () => this.setupVT100(instance),100)
+        this.setupVT100(instance)
+        setTimeout( () => {
+          instance.setAttribute("html-as-texture-in-xr", `domid: #term; faceuser: true`)
+        },100)
         //instance.winbox.resize(720,380)
         let size = `width: ${this.data.width}; height: ${this.data.height}`
         instance.setAttribute("window", `title: xrsh.iso; uid: ${instance.uid}; attach: #overlay; dom: #${instance.dom.id}; ${size}; min: ${this.data.minimized}; max: ${this.data.maximized}`)
@@ -231,6 +229,8 @@ if( typeof AFRAME != 'undefined '){
         // run iso
         let opts = {dom:instance.dom}
         for( let i in this.data ) opts[i] = this.data[i]
+        opts.cols = this.cols
+        opts.rows = this.rows
         this.term.start(opts)
       })
 
@@ -262,6 +262,7 @@ if( typeof AFRAME != 'undefined '){
         if( this.el.components.window && this.data.renderer == 'canvas'){
           this.el.components.window.show( showdom )
         }
+        this.el.emit('focus',e.detail)
       }
 
       this.el.addEventListener('obbcollisionstarted', focus(false) )
@@ -290,17 +291,20 @@ if( typeof AFRAME != 'undefined '){
     },
 
     setupVT100: function(instance){
-      const el = this.el.dom.querySelector('#vt100')
-      this.vt100 = new VT100( 
-        Math.floor(this.data.width/this.data.lineHeight),
-        Math.floor(this.data.height*0.8/this.data.lineHeight), 
-        el, 
-        100 
-      )
+      const el = this.el.dom.querySelector('#term')
+      const opts = {
+        cols: this.cols, 
+        rows: this.rows,
+        el_or_id: el,
+        max_scroll_lines: 100, 
+        nodim: true
+      }
+      this.vt100 = new VT100( opts )
+      this.vt100.el = el
       this.vt100.curs_set( 1, true)
       el.focus()
+      this.el.addEventListener('focus', () => el.focus())
       this.vt100.getch( (ch,t) => {
-        console.log(ch)
         this.term.send( ch )
         this.vt100.curs_set( 0, true)
       })
@@ -323,6 +327,27 @@ if( typeof AFRAME != 'undefined '){
       //})
     },
 
+    setupBox: function(){
+      // setup slightly bigger black backdrop (this.el.getObject3D("mesh")) 
+      const w = this.data.width/950;
+      const h = this.data.height/950;
+      this.el.box = document.createElement('a-entity')
+      this.el.box.setAttribute("geometry",`primitive: box; width:${w}; height:${h}; depth: -${this.data.depth}`)
+      this.el.box.setAttribute("material","shader:flat; color:black; opacity:0.9; transparent:true; ")
+      this.el.box.setAttribute("position",`0 0 ${(this.data.depth/2)-0.001}`)
+      this.el.appendChild(this.el.box)
+    },
+
+    calculateDimension: function(){
+      if( this.data.width == -1  ) this.data.width = document.body.offsetWidth
+      if( this.data.height == -1 ) this.data.height = document.body.offsetHeight
+      if( this.data.height > this.data.width ) this.data.height = this.data.width // mobile smartphone fix
+      this.data.width -= this.data.padding*2
+      this.data.height -= this.data.padding*2
+      this.cols = Math.floor(this.data.width/this.data.lineHeight*1.9)
+      this.rows = Math.floor(this.data.height*0.5/this.data.lineHeight*1.7) // keep extra height for mobile browser bottom-bar (android)
+    },
+
     events:{
 
       // combined AFRAME+DOM reactive events

com/isoterminal/ISOTerminal.js

@@ -61,11 +61,11 @@ ISOTerminal.prototype.convert = {
       const bytes = new Uint8Array(buffer);
       const len = bytes.byteLength;
       for (let i = 0; i < len; i++) binary += String.fromCharCode(bytes[i]);
-      return window.btoa(binary);
+      return btoa(binary);
   },
 
   base64ToArrayBuffer: function(base64) {
-      const binaryString = window.atob(base64);
+      const binaryString = atob(base64);
       const len = binaryString.length;
       const bytes = new Uint8Array(len);
 
@@ -211,11 +211,14 @@ ISOTerminal.prototype.startVM = function(opts){
 \r ▬▬▬▬▬▬▬▬ https://xrsh.isvery.ninja ▬▬▬▬▬▬▬▬▬▬▬▬
 \r local-first, polyglot, unixy WebXR IDE & runtime
 \r
-\r credits: NLnet           | @nlnet@nlnet.nl 
-\r          Leon van Kammen | @lvk@mastodon.online
-\r          Fabien Benetou  | @utopiah@mastodon.pirateparty.be 
-\r          Mr Doob         | THREE.js 
-\r          Diego Marcos    | AFRAME.js
+\r credits
+\r ------- 
+\r @nlnet@nlnet.nl 
+\r @lvk@mastodon.online
+\r @utopiah@mastodon.pirateparty.be 
+\r https://www.w3.org/TR/webxr
+\r https://three.org 
+\r https://aframe.org 
   `
 
   const text_color = "\r" 

com/isoterminal/VT100.js

@@ -1,8 +1,15 @@
-// https://raw.githubusercontent.com/vsinitsyn/vt100/refs/heads/coffeescript/public/javascripts/VT100.js
+// https://raw.githubusercontent.com/vetupinitsyn/vt100/refs/heads/coffeescript/public/javascripts/VT100.js
 // 
 // VT100.js -- a text terminal emulator in JavaScript with a ncurses-like
 // interface and a POSIX-like interface. (The POSIX-like calls are
 // implemented on top of the ncurses-like calls, not the other way round.)
+// 
+// required markup:
+//
+//   <div id="term" tabindex="0">
+//      <pre></pre>
+//   </div>
+
 //
 // Released under the GNU LGPL v2.1, by Frank Bi <bi@zompower.tk>
 //
@@ -77,8 +84,10 @@
 //			interpreted and acted on.
 
 // constructor
-function VT100(wd, ht, el_or_id, max_scroll_lines, fg, bg)
+function VT100(opts)
 {
+  this.opts = opts
+  let {cols, rows, el_or_id, max_scroll_lines, fg, bg, nodim} = opts
 	if (!max_scroll_lines) {
 		max_scroll_lines = 1000;
 	}
@@ -92,20 +101,20 @@ function VT100(wd, ht, el_or_id, max_scroll_lines, fg, bg)
 	var r;
 	var c;
 	var scr = typeof el_or_id == 'string' ? document.getElementById(el_or_id) : el_or_id
-	this.wd_ = wd;
-	this.ht_ = ht;
+	this.wd_ = cols;
+	this.ht_ = rows;
 	// Keep up to max_scroll_lines of scrollback history.
 	this.max_ht_ = max_scroll_lines;
 	this._set_colors(fg, bg);
-	this.text_ = new Array(ht);
-	this.attr_ = new Array(ht);
-	this.redraw_ = new Array(ht);
-	this.scroll_region_ = [0, ht-1];
+	this.text_ = new Array(rows);
+	this.attr_ = new Array(rows);
+	this.redraw_ = new Array(rows);
+	this.scroll_region_ = [0, rows-1];
 	this.start_row_id = 0;
-	this.num_rows_ = ht;
-	for (r = 0; r < ht; ++r) {
-		this.text_[r] = new Array(wd);
-		this.attr_[r] = new Array(wd);
+	this.num_rows_ = rows;
+	for (r = 0; r < rows; ++r) {
+		this.text_[r] = new Array(cols);
+		this.attr_[r] = new Array(cols);
 		this.redraw_[r] = 1;
 	}
 	this.scr_ = scr;
@@ -116,10 +125,14 @@ function VT100(wd, ht, el_or_id, max_scroll_lines, fg, bg)
 	this.key_buf_ = [];
 	this.echo_ = false;
 	this.esc_state_ = 0;
-	this.log_level_ = VT100.DEBUG //WARN;
+	this.log_level_ = VT100.WARN 
 
 	this.clear_all();
-	this.refresh();
+
+  // rate limit this.refresh
+  this.refresh = this.throttleSmart( VT100.prototype.refresh.bind(this), 100)
+
+  this.setupTouchInputFallback() // smartphone
 }
 
 // public constants -- colours and colour pairs
@@ -172,6 +185,7 @@ VT100.handle_onkeypress_ = function VT100_handle_onkeypress(event,cb)
 	var vt = VT100.the_vt_, ch;
 	if (vt === undefined)
 		return true;
+
 	//if ( event.keyCode != undefined || !event.charCode){
 	//	ch = event.keyCode;
 	//	if (ch == 13)
@@ -180,11 +194,11 @@ VT100.handle_onkeypress_ = function VT100_handle_onkeypress(event,cb)
 	//		return true;
 	//	ch = String.fromCharCode(ch);
 	//} else {
-  ch = event.charCode;
   //dump("ch: " + ch + "\n");
   //dump("ctrl?: " + event.ctrlKey + "\n");
-  vt.debug("onkeypress:: keyCode: " + event.keyCode + ", ch: " + event.charCode);
-  if (ch) {
+  vt.debug("onkeypress:: ch: " + event.code + " ,key: "+event.key);
+  if (event.key.length == 1) {
+    ch = event.key.charCodeAt(0)
     if (ch > 255)
       return true;
     if (event.ctrlKey && event.shiftKey) {
@@ -203,51 +217,52 @@ VT100.handle_onkeypress_ = function VT100_handle_onkeypress(event,cb)
     }
   } else {
     switch (event.key) {
-        case "Backspace":
-      ch = '\b';
-      break;
-        case "Tab":
-      ch = '\t';
-      break;
-        case event.DOM_VK_RETURN:
-        case event.DOM_VK_ENTER:
-      ch = '\r';
-      break;
-        case event.DOM_VK_UP:
-      if (this.cursor_key_mode_ == VT100.CK_CURSOR)
+      case "Backspace":
+        ch = '\b';
+        break;
+      case "Tab":
+        ch = '\t';
+        break;
+      case "Enter":
+        ch = '\n';
+        break;
+      case "ArrowUp":
+        if (this.cursor_key_mode_ == VT100.CK_CURSOR)
         ch = '\x1b[A';
-      else
+        else
         ch = '\x1bOA';
-      break;
-        case event.DOM_VK_DOWN:
-      if (this.cursor_key_mode_ == VT100.CK_CURSOR)
+        break;
+      case "ArrowDown":
+        if (this.cursor_key_mode_ == VT100.CK_CURSOR)
         ch = '\x1b[B';
-      else
+        else
         ch = '\x1bOB';
-      break;
-        case event.DOM_VK_RIGHT:
-      if (this.cursor_key_mode_ == VT100.CK_CURSOR)
+        break;
+      case "ArrowRight":
+        if (this.cursor_key_mode_ == VT100.CK_CURSOR)
         ch = '\x1b[C';
-      else
+        else
         ch = '\x1bOC';
-      break;
-        case event.DOM_VK_LEFT:
-      if (this.cursor_key_mode_ == VT100.CK_CURSOR)
+        break;
+      case "ArrowLeft":
+        if (this.cursor_key_mode_ == VT100.CK_CURSOR)
         ch = '\x1b[D';
-      else
+        else
         ch = '\x1bOD';
-      break;
-        case event.DOM_VK_DELETE:
-      ch = '\x1b[3~';
-      break;
-        case event.DOM_VK_HOME:
-      ch = '\x1b[H';
-      break;
-        case event.DOM_VK_ESCAPE:
-      ch = '\x1b';
-      break;
-        default:
-      return true;
+        break;
+      case "Delete":
+        ch = '\x1b[3~';
+        break;
+      case "Home":
+        ch = '\x1b[H';
+        break;
+      case "Escape":
+        ch = '\x1b';
+      case "Control":
+        break;
+      default:
+        return true
+        break;
     }
   }
   // Stop the event from doing anything else.
@@ -311,39 +326,39 @@ VT100.prototype.html_colours_ = function VT100_html_colours_(attr)
 	var fg, bg, co0, co1;
 	fg = attr.fg;
 	bg = attr.bg;
-	switch (attr.mode & (VT100.A_REVERSE | VT100.A_DIM | VT100.A_BOLD)) {
-	    case 0:
-	    case VT100.A_DIM | VT100.A_BOLD:
-		co0 = '00';
-		if (bg == VT100.COLOR_WHITE)
-			co1 = 'ff';
-		else
-			co1 = 'c0';
-		break;
-	    case VT100.A_BOLD:
-		co0 = '00';  co1 = 'ff';
-		break;
-	    case VT100.A_DIM:
-		if (fg == VT100.COLOR_BLACK)
-			co0 = '40';
-		else
-			co0 = '00';
-		co1 = '40';
-		break;
-	    case VT100.A_REVERSE:
-	    case VT100.A_REVERSE | VT100.A_DIM | VT100.A_BOLD:
-		co0 = 'c0';  co1 = '40';
-		break;
-	    case VT100.A_REVERSE | VT100.A_BOLD:
-		co0 = 'c0';  co1 = '00';
-		break;
-	    default:
-		if (fg == VT100.COLOR_BLACK)
-			co0 = '80';
-		else
-			co0 = 'c0';
-		co1 = 'c0';
-	}
+  switch (attr.mode & (VT100.A_REVERSE | VT100.A_DIM | VT100.A_BOLD)) {
+    case 0:
+    case VT100.A_DIM | VT100.A_BOLD:
+      co0 = '00';
+      if (bg == VT100.COLOR_WHITE)
+      co1 = 'ff';
+      else
+      co1 = 'c0';
+      break;
+    case VT100.A_BOLD:
+      co0 = '00';  co1 = 'ff';
+      break;
+    case VT100.A_DIM:
+      if (fg == VT100.COLOR_BLACK)
+        co0 = '40';
+      else
+        co0 = '00';
+        co1 = '40';
+      break;
+    case VT100.A_REVERSE:
+    case VT100.A_REVERSE | VT100.A_DIM | VT100.A_BOLD:
+      co0 = 'c0';  co1 = 'ff';
+      break;
+    case VT100.A_REVERSE | VT100.A_BOLD:
+      co0 = 'c0';  co1 = '00';
+      break;
+    default:
+      if (fg == VT100.COLOR_BLACK)
+      co0 = '80';
+      else
+      co0 = 'c0';
+      co1 = 'c0';
+  }
 	return {
 		f: '#' + (fg & 4 ? co1 : co0) +
 			 (fg & 2 ? co1 : co0) +
@@ -1283,6 +1298,52 @@ VT100.prototype.warn = function VT100_warn(message) {
 	}
 }
 
+VT100.prototype.throttleSmart = function throttleSmart(fn, wait) {
+  let timeout, lastArgs; 
+  return (...args) => { 
+    lastArgs = lastArgs || []
+    if (!timeout) { 
+      fn(...args); timeout = setTimeout(() => { fn(...lastArgs); timeout = null; }, wait); 
+    } else lastArgs = args; 
+  };
+}
+
+VT100.prototype.setupTouchInputFallback = function(){
+  this.scr_.addEventListener('touchend', () => {
+    if( !this.input ){
+      this.form  = document.createElement("form")
+      this.form.addEventListener("submit", (e) => {
+        e.preventDefault()
+        this.key_buf_.push('\n')
+        setTimeout(VT100.go_getch_, 0);
+      })
+      this.input = document.createElement("input")
+      this.input.setAttribute("cols", this.opts.cols )
+      this.input.setAttribute("rows", this.opts.rows )
+      this.input.style.opacity = '0'
+      this.input.style.position = 'absolute'
+      this.input.style.left = '-9999px'
+      this.form.appendChild(this.input)
+      this.scr_.parentElement.appendChild(this.form)
+
+      this.input.handler = () => {
+        let ch = this.input.value
+        // detect backspace
+        //if( e.inputType == 'deleteContentBackward' ) ch = '\b'
+        this.input.value = ''
+        if( !ch ) return
+        this.key_buf_.push(ch);
+        setTimeout(VT100.go_getch_, 0);
+        this.input.valueLast = this.input.value
+      }
+      this.input.addEventListener('input', this.input.handler ) 
+
+    }
+    setTimeout( () => this.input.focus(), 10 )
+  })
+}
+
 function dump(x) {
 	// Do nothing
+  console.log(x)
 }

com/isoterminal/feat/autorestore.js

@@ -1,15 +1,31 @@
 if( typeof emulator != 'undefined' ){
   // inside worker-thread
+  importScripts("localforage.js")  // we don't instance it again here (just use its functions)
   
   this['emulator.restore_state'] = async function(data){ 
-    await emulator.restore_state(data)
-    console.log("restored state")
-    this.postMessage({event:"state_restored",data:false})
+    return new Promise( (resolve,reject) => {
+      localforage.getItem("state", async (err,stateBase64) => {
+        if( stateBase64 && !err ){
+          state = ISOTerminal.prototype.convert.base64ToArrayBuffer( stateBase64 )
+          await emulator.restore_state(state)
+          console.log("restored state")
+        }else return reject("worker.js: emulator.restore_state (could not get state from localforage)")
+        resolve()
+      })
+    })
   }
   this['emulator.save_state'] = async function(){ 
     console.log("saving session")
     let state = await emulator.save_state()
-    this.postMessage({event:"state_saved",data:state},[state])
+    localforage.setDriver([
+      localforage.INDEXEDDB,
+      localforage.WEBSQL,
+      localforage.LOCALSTORAGE
+    ]).then( () => {
+      localforage.setItem("state", ISOTerminal.prototype.convert.arrayBufferToBase64(state) )
+      console.log("state saved")
+    })
+    console.dir(state)
   }
 
 
@@ -30,30 +46,21 @@ if( typeof emulator != 'undefined' ){
       localforage.getItem("state", async (err,stateBase64) => {
         if( stateBase64 && !err && confirm('continue last session?') ){
           this.noboot = true // see feat/boot.js
-          state = this.convert.base64ToArrayBuffer( stateBase64 )
-
-          this.addEventListener('state_restored', function(){
+          try{
+            await this.worker['emulator.restore_state']()
             // simulate / fastforward boot events
             this.postBoot( () => {
               this.send("
l\n") 
               this.send("hook wakeup\n")
             })
-          })
-
-          this.worker.postMessage({event:'emulator.restore_state',data:state})
+          }catch(e){ console.error(e) }
         } 
       })
 
       this.save = async () => {
-        const state = await this.worker.postMessage({event:"emulator.save_state",data:false})
+        await this.worker['emulator.save_state']()
       }
 
-      this.addEventListener('state_saved', function(e){
-        const state = e.detail
-        localforage.setItem("state", this.convert.arrayBufferToBase64(state) )
-        console.log("state saved")
-      })
-
       window.addEventListener("beforeunload", function (e) {
         var confirmationMessage = "Sure you want to leave?\nTIP: enter 'save' to continue this session later";
         (e || window.event).returnValue = confirmationMessage; //Gecko + IE

com/isoterminal/feat/boot.js

@@ -4,7 +4,11 @@ ISOTerminal.addEventListener('ready', function(e){
 
 ISOTerminal.prototype.boot = async function(e){
   // set environment
-  let env = ['export BROWSER=1']
+  let env = [
+    `export LINES=${this.opts.rows}`,
+    `export COLUMNS=${this.opts.cols}`,
+    'export BROWSER=1',
+  ]
   for ( let i in document.location ){
     if( typeof document.location[i] == 'string' ){
       env.push( 'export '+String(i).toUpperCase()+'="'+decodeURIComponent( document.location[i]+'"') )